You can have up to 4 party members + 1 summon/party member, so that giving heavy armor to a caster is rather unnecessary. My Warrior wearing full Plate Armour only had 189 Armour (230 if I would have boosted Armour Specialist to 7) at the end of the game while the mage in robes still had 127.
Don't use the Thick skin talent - even with 5 levels in Man at Arms it is still only a small bonus.

Last edited by eidolon; 28/07/14 12:52 PM.